| 摘要 |
<p>A dental prophylactic cup (100) comprises a flexible body having a cavity (122) formed therein. A rear end of the cavity includes a paste reservoir (126) for storing an abrasive paste. Paste delivery channels extend forwardly from the reservoir and intersect front and rear circumferentially extending paste distribution channels (130, 132). Under the action of centrifugal force occurring during a tooth cleaning procedure, paste if fed forwardly along the delivery channels and is distributed within the distribution channels (130, 132). Between the channels is disposed a pattern of ridges (134, 136) capable of flexing relative to one another to conform to the shape of a tooth surface. A ratio (T2/T1) of a thickness (T2) of a mouth of the cavity to a minimal wall thickness (T1) at a forward-most paste distribution channel is in the range of 0.0 to 0.75. A ratio (T1/L) of the wall thickness (T1) to a length (L) of the cavity is in the range of 0.16 to 0.24.</p> |
